Gmail very slow to receive Sendmail/PHP Mail


 
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Old 04-26-2016
Reference Gmail very slow to receive Sendmail/PHP Mail

Okay, I have searched the forums and couldn't really find a topic on this, so I decided to start one. But I decided to start a ncurses discussion forum recently and one thing I noticed while getting it going is that when mail is sent out via Sendmail or PHP Mail, Gmail is /very/ slow to receive it. About 15-20 minutes in total. It doesn't matter who the recipient is, as I've tested this with a pool of several different people. But when sending by SMTP, it's instant!

I'd understand if they were using greylisting or something similar, but why is one protocol slow and the other fast? Any insight into this would be greatly appreciated. I have also checked the mail queues and there is no holdups in those, so that can't be it.
 
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Mail::Mailer(3) 					User Contributed Perl Documentation					   Mail::Mailer(3)

NAME
Mail::Mailer - Simple interface to electronic mailing mechanisms INHERITANCE
Mail::Mailer is a IO::Handle SYNOPSIS
use Mail::Mailer; use Mail::Mailer qw(mail); # specifies default mailer $mailer = Mail::Mailer->new; $mailer = Mail::Mailer->new($type, @args); $mailer->open(\%headers); print $mailer $body; $mailer->close or die "couldn't send whole message: $! "; DESCRIPTION
Sends mail using any of the built-in methods. As TYPE argument to new(), you can specify any of "sendmail" Use the "sendmail" program to deliver the mail. "smtp" Use the "smtp" protocol via Net::SMTP to deliver the mail. The server to use can be specified in @args with $mailer = Mail::Mailer->new('smtp', Server => $server); The smtp mailer does not handle "Cc" and "Bcc" lines, neither their "Resent-*" fellows. The "Debug" options enables debugging output from "Net::SMTP". You may also use the "Auth => [ $user, $password ]" option for SASL authentication. To make this work, you have to install the Authen::SASL distribution yourself: it is not automatically installed. "smtps" Use the smtp over ssl protocol via Net::SMTP::SSL to deliver the mail. Usage is identical to "smtp". $mailer = Mail::Mailer->new('smtps', Server => $server); "qmail" Use qmail's qmail-inject program to deliver the mail. "testfile" Used for debugging, this displays the data to the file named in $Mail::Mailer::testfile::config{outfile} which defaults to a file named "mailer.testfile". No mail is ever sent. "Mail::Mailer" will search for executables in the above order. The default mailer will be the first one found. METHODS
Constructors Mail::Mailer->new(TYPE, ARGS) The TYPE is one of the back-end sender implementations, as described in the DESCRIPTION chapter of this manual page. The ARGS are passed to that back-end. $obj->open(HASH) The HASH consists of key and value pairs, the key being the name of the header field (eg, "To"), and the value being the corresponding contents of the header field. The value can either be a scalar (eg, "gnat@frii.com") or a reference to an array of scalars ("eg, ['gnat@frii.com', 'Tim.Bunce@ig.co.uk']"). DETAILS
ENVIRONMENT VARIABLES PERL_MAILERS Augments/override the build in choice for binary used to send out our mail messages. Format: "type1:mailbinary1;mailbinary2;...:type2:mailbinaryX;...:..." Example: assume you want you use private sendmail binary instead of mailx, one could set "PERL_MAILERS" to: "mail:/does/not/exists:sendmail:$HOME/test/bin/sendmail" On systems which may include ":" in file names, use "|" as separator between type-groups. "mail:c:/does/not/exists|sendmail:$HOME/test/bin/sendmail" BUGS Mail::Mailer does not help with folding, and does not protect against various web-script hacker attacks, for instance where a new-line is inserted in the content of the field. SEE ALSO
This module is part of the MailTools distribution, http://perl.overmeer.net/mailtools/. AUTHORS
The MailTools bundle was developed by Graham Barr. Later, Mark Overmeer took over maintenance without commitment to further development. Mail::Cap by Gisle Aas <aas@oslonett.no>. Mail::Field::AddrList by Peter Orbaek <poe@cit.dk>. Mail::Mailer and Mail::Send by Tim Bunce <Tim.Bunce@ig.co.uk>. For other contributors see ChangeLog. LICENSE
Copyrights 1995-2000 Graham Barr <gbarr@pobox.com> and 2001-2007 Mark Overmeer <perl@overmeer.net>. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See http://www.perl.com/perl/misc/Artistic.html perl v5.12.1 2010-01-26 Mail::Mailer(3)